respectively. Fig. 4 shows the effect of adding DEE to the Jojoba
Methyl Ester at the rate of 5%, 10%, and 15% as compared to pure
JME as well as diesel fuel on the exhaust gas temperature. It may
be seen from the figure that increasing the brake mean effective
pressure generally increases the exhaust temperature as the load
is increased and the amount of fuel used is increased. It may be
seen also that the exhaust gas temperature is almost the same
for diesel engine using diesel fuel, JME, or using JME with 5% or
10% or 15% DEE. This is at the low and high load range. Although
the heating value of the DEE is lower than for diesel and for JME,
it is at low mixing ratio (up to 15%) and it did not change much
the exhaust gas temperature or other cycle temperature.
Fig. 5 illustrates the effect of the load and heating the JME on
the exhaust gas temperature of the diesel engine. It may be seen
from the figure that the exhaust gas temperatures for diesel and
JME at ambient temperature of 25 C are almost the same at all
loads as the JME has similar calorific value and did not change
the cycle temperatures. However, it is noticed that when JME is
heated to 50 or 70 C the gas temperature is reduced slightly. Heating
the JME appears to cause the cycle temperatures near the end
of the expansion stroke to reduce due to the early self-ignition of
JME when heated as discussed below.
respectively. Fig. 4 shows the effect of adding DEE to the JojobaMethyl Ester at the rate of 5%, 10%, and 15% as compared to pureJME as well as diesel fuel on the exhaust gas temperature. It maybe seen from the figure that increasing the brake mean effectivepressure generally increases the exhaust temperature as the loadis increased and the amount of fuel used is increased. It may beseen also that the exhaust gas temperature is almost the samefor diesel engine using diesel fuel, JME, or using JME with 5% or10% or 15% DEE. This is at the low and high load range. Althoughthe heating value of the DEE is lower than for diesel and for JME,it is at low mixing ratio (up to 15%) and it did not change muchthe exhaust gas temperature or other cycle temperature.Fig. 5 illustrates the effect of the load and heating the JME onthe exhaust gas temperature of the diesel engine. It may be seenfrom the figure that the exhaust gas temperatures for diesel andJME at ambient temperature of 25 C are almost the same at allloads as the JME has similar calorific value and did not changethe cycle temperatures. However, it is noticed that when JME isheated to 50 or 70 C the gas temperature is reduced slightly. Heatingthe JME appears to cause the cycle temperatures near the endof the expansion stroke to reduce due to the early self-ignition ofJME when heated as discussed below.
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